Tunnel 29

Shortly after his miraculous escape over the border of East Berlin, Joachim Rudolph risks it all to return and rescue dozens of others through a tunnel he builds under the Berlin Wall. NBC filmed the rescuers' attempts in extraordinary documentary footage, which changed journalism forever. Merriman spent hours with Rudolph getting his story. Guest: Helena Merriman, author of "Tunnel 29: The True Story of an Extraordinary Escape Beneath the Berlin Wall"